From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B868D4779B8; Tue, 16 Jun 2026 16:35:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627711; cv=none; b=Up8gJPlyOyQWqXpMjH6BKNNif5uvFh4PH6EgcQfcirYns6B+27uAAi3lCjzg7aHrVpaFaASAk7T9zIFEXBPAPj3a4Ej7rHk53WtCeryTdI2HAcKLyj8Gf5b6JWy7g0ShSLNseF+SIcxL+yzDESQdL/aQRaau1Xb6x69tgqHIOQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627711; c=relaxed/simple; bh=XW+GMvGv7dQN+MR7h7PykbUc+IRb/HGWlFo7I+Tm4rw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VbgdXj8SH0aPZJI8pvzvIQZfuKQ0KhRCpkDsMU/toitpuWDx22w6zvyx56cbfrkaQBrKrLtFk+1q/y7ni4vECM0lYoS+c6S3LTESj5RIVxIMaiLoKNvZzmOui4AXYi453UMNSVdy5QVB4G/UuIB30SCIG2P5spfS93jQ8PVV7wY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fNXODQsg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fNXODQsg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A21031F000E9; Tue, 16 Jun 2026 16:35:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781627710; bh=pCdVecW8JFhBL6d8vPbZ+kD2mTBfHJmCEier+FFgykY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fNXODQsgxcOukzXTKhkLfXd8ZHNZvN9h1WOP9TGKBBGO5/r8O4HBHqXXAz/o67LBJ axRiRWmPO5xdqTmwvfLliJ/BeEdWKMYYgywMbn0te4vxXxfGK0/qXOmqtjtfQrOXCB Kpk57SR1l5A18cPATPIpnrr3YX4S0fmyPQVBpaMY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo , Dmitry Baryshkov , Srinivas Kandagatla Subject: [PATCH 6.12 180/261] misc: fastrpc: fix DMA address corruption due to find_vma misuse Date: Tue, 16 Jun 2026 20:30:18 +0530 Message-ID: <20260616145053.414416275@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145044.869532709@linuxfoundation.org> References: <20260616145044.869532709@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo commit 464c6ad2aa16e1e1df9d559289199356493d1e00 upstream. fastrpc_get_args() uses find_vma() to look up the VMA for a user-provided pointer and compute a DMA address offset. When the address falls in a gap before the returned VMA, (ptr & PAGE_MASK) - vma->vm_start underflows, corrupting the DMA address sent to the DSP. Replace find_vma() with vma_lookup(), which returns NULL when the address is not contained within any VMA. Cc: stable@vger.kernel.org Fixes: 80f3afd72bd4 ("misc: fastrpc: consider address offset before sending to DSP") Reported-by: Yuhao Jiang Signed-off-by: Junrui Luo Reviewed-by: Dmitry Baryshkov Signed-off-by: Srinivas Kandagatla Link: https://patch.msgid.link/20260530204528.116920-3-srini@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/misc/fastrpc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -1061,7 +1061,7 @@ static int fastrpc_get_args(u32 kernel, pages[i].addr = ctx->maps[i]->phys; mmap_read_lock(current->mm); - vma = find_vma(current->mm, ctx->args[i].ptr); + vma = vma_lookup(current->mm, ctx->args[i].ptr); if (vma) pages[i].addr += (ctx->args[i].ptr & PAGE_MASK) - vma->vm_start;